Many years ago I assembled a buffer with a 1-1/2 hp motor, pillow blocks and a custom 1" shaft with reverse threads on one end and accommodation for a large taper adapter on the other. The first time I used it with an 8" wheel to polish a long gas light fixture. I was almost done, working on the inside of a radius when it whipped the fixture out of my hand, slapped it across my face and broke my nose. I was lucky I didn't loose and eye and since I was laid off at the time, didn't have insurance and didn't seek treatment. My nose still tells the tale. After consulting with polisher I was informed the wheel should spin towards the operator so as to throw the work towards the ground. I was also told not to let go of the work. I had worked in custom sheet metal shops for 8 years at the time and should have known better. I still use it but with the direction as suggested and I'm much more careful now.